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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb3e835ac438cb1ffa8764bc644e3424025ea363a366b9c794100d01a9c1823' 
  AND token = 'zkys3XlClFfRwGlomM9MmoY0F0ug2Czsv1GxGQeWjMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}